i listened to the 5300s today... i must say... they are decent for the size of those woofers... they werent as authoritative as the klipsch ultras (in terms of midrange reproduction, not just bass)... the guitar just sounded a little more present in the ultras than it did on the 5300s.
also, the phase plug on the 5300s are REAL. they arent the fake glued on crap that was present in the z560s... and maybe the 680s... not sure though about the 680s having fake phase plugs... will check next time.